Amphibole is a group of silicate minerals that are commonly found in igneous and metamorphic rocks. These minerals are characterized by their double-chain silicate structure, which gives them unique properties such as a high resistance to heat and chemical weathering. Amphiboles can appear in various colors, including green, black, and brown, and are often used in geological studies to understand rock formation and history. Some common types of amphibole include hornblende and tremolite. These minerals play a significant role in the Earth's crust and can influence the physical properties of rocks. Amphibole minerals are also important in industrial applications, such as in the production of asbestos, although safety concerns have limited their use in recent years.